Big Rock Creek lies in the Angeles National Forest on the north side of the San Gabriel Mountains. It is part of the Tujunga Res. system. From I-5 take the Antelope Valley frwy. (14) east to Pearblossom hwy. Continue east on Pearblossom to Longview and go south. Veer left to Valyermo and continue south for 5 miles.

Like many of the mountain streams in SoCal, this was once a very popular fishing spot, receiving weekly plantings of rainbow trout from the DFW. Sometime during the early 21st century, the DFW halted all rainbow trout plants here in an effort to protect the endangered mountain yellow-legged frog which supposedly lives here. There are still some wild trout here. Be sure to visit the CDFW web site for complete regulations before heading out.